108 lines
2.1 KiB
Plaintext
108 lines
2.1 KiB
Plaintext
//
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// ShnFile.mm
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// Cog
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//
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// Created by Vincent Spader on 6/6/05.
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// Copyright 2005 Vincent Spader All rights reserved.
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//
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#import "ShortenDecoder.h"
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@implementation ShortenDecoder
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- (BOOL)open:(id<CogSource>)source
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{
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NSURL *url = [source url];
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[source close];
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if (![[url scheme] isEqualToString:@"file"])
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return NO;
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decoder = new shn_reader;
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if (!decoder)
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{
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return NO;
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}
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decoder->open([[url path] UTF8String], true);
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bufferSize = decoder->shn_get_buffer_block_size(NUM_DEFAULT_BUFFER_BLOCKS);
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bool seekTable;
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decoder->file_info(NULL, &channels, &frequency, NULL, &bitsPerSample, &seekTable);
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seekable = seekTable == true ? YES : NO;
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totalFrames = (decoder->shn_get_song_length() * frequency)/1000.0;
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decoder->go();
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[self willChangeValueForKey:@"properties"];
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[self didChangeValueForKey:@"properties"];
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return YES;
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}
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- (int)readAudio:(void *)buf frames:(UInt32)frames
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{
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int bytesPerFrame = channels * (bitsPerSample/8);
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int amountRead;
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//For some reason a busy loop is causing pops when output is set to 48000. Probably CPU starvation, since the SHN decoder seems to use a multithreaded nonblocking approach.
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do
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{
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amountRead = decoder->read(buf, frames * bytesPerFrame);
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} while(amountRead == -1);
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return amountRead/bytesPerFrame;
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}
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- (long)seek:(long)sample
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{
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unsigned int sec = sample/frequency;
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decoder->seek(sec);
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return sample;
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}
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- (void)close
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{
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if(decoder)
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{
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decoder->exit();
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delete decoder;
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decoder = NULL;
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}
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/*if (shn_cleanup_decoder(handle))
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shn_unload(handle);*/
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}
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- (NSDictionary *)properties
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{
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return [NSDictionary dictionaryWithObjectsAndKeys:
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[NSNumber numberWithInt:channels],@"channels",
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[NSNumber numberWithInt:bitsPerSample],@"bitsPerSample",
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[NSNumber numberWithFloat:frequency],@"sampleRate",
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[NSNumber numberWithDouble:totalFrames],@"totalFrames",
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[NSNumber numberWithBool:seekable ],@"seekable",
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@"little",@"endian",
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nil];
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}
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+ (NSArray *)fileTypes
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{
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return [NSArray arrayWithObject:@"shn"];
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}
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+ (NSArray *)mimeTypes
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{
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return [NSArray arrayWithObjects:@"application/x-shorten", nil]; //This is basically useless, since we cant stream shorten yet
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}
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@end
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